A battery top cover assembly and a battery

Abstract

The utility model discloses a battery top cover assembly and battery, battery top cover assembly includes apron, pole and upper plastic, wherein, apron has the first surface and second surface of opposite setting, and the through -hole is set up with the first surface and second surface penetration, pole and apron insulation are connected, including the column and base, the column penetration through the through -hole, and the base is limited to one side of the second surface of apron, the upper plastic sets up in the first surface of apron, and is set up in the column one end away from the base, wherein, the first surface has the first recess, and the upper plastic is equipped with the first protruding of corresponding with the first recess, and the first protruding hot melt joint is in the first recess. In this way, corresponding first protruding and first recess are arranged on the apron and the upper plastic, the upper plastic is fixed with the apron by the first protruding hot melt joint in the first recess, and then the upper plastic, apron and pole are fixed, the assembly of battery top cover assembly is completed, the efficiency of battery top cover assembly assembly is improved, and then the assembly efficiency of battery is improved.

Description

Technical Field

[0001] This utility model relates to the field of batteries, and in particular to a battery top cover assembly and a battery. Background Technology

[0002] As a crucial structural component of the battery, the battery cover serves to seal the casing and connect to the external circuitry. The cover comprises several structural parts. Its assembly mainly involves assembling the terminals, sealing components, and aluminum plate in a specific order, then riveting them together to secure them and achieve a seal. Next, an injection molding process is applied around the terminals to isolate them from the aluminum plate, achieving insulation. Because a certain pressure holding time is required after injection molding for the plastic to solidify, the assembly cycle for the cover is relatively long.

[0003] Traditional injection molding overmolding processes are time-consuming, with a single machine producing approximately 3 pieces per minute. This results in low efficiency, insufficient production capacity, and high labor costs, leading to high cover plate costs.

[0004] Therefore, there is an urgent need for a new type of cover plate that can solve the above problems. Utility Model Content

[0005] The technical problem to be solved by this utility model embodiment is how to provide a battery top cover assembly and a battery that can improve battery assembly efficiency.

[0006] To solve the above-mentioned technical problems, this utility model provides a battery top cover assembly, including a cover plate, a terminal post, and an upper plastic. The cover plate has a first surface and a second surface arranged opposite to each other, and a through hole is formed through the first surface and the second surface. The terminal post is insulated from the cover plate and includes a post body and a base. The post body passes through the through hole, and the base is located on one side of the second surface of the cover plate. The upper plastic is disposed on the first surface of the cover plate and sleeved on the end of the post body away from the base. The first surface has a first groove, and the upper plastic has a first protrusion corresponding to the first groove. The first protrusion is heat-fused and snapped into the first groove.

[0007] In one feasible implementation, the projected area of ​​the bottom of the first groove on the first surface is greater than the projected area of ​​the opening of the first groove on the first surface.

[0008] In one feasible implementation, the width of the first groove opening gradually decreases from the bottom of the groove to the opening.

[0009] In one feasible implementation, the angle between the inner sidewall of the first groove and the bottom wall is 70° to 85°.

[0010] In one feasible implementation, the height of the first protrusion is 0.9mm to 1.1mm, and the diameter of the first protrusion is greater than 1.5mm.

[0011] In one feasible implementation, the bottom of the upper plastic is provided with an abutment portion that abuts against the first surface, and a first protrusion is provided on the abutment portion. The width of the abutment portion parallel to the length direction of the cover plate is 5mm to 8mm.

[0012] In one feasible implementation, the first surface is further provided with a second groove. The first groove is formed on the bottom surface of the first groove. The bottom of the upper plastic is accommodated in the second groove, and the bottom of the upper plastic is provided with an edge portion corresponding to the second groove. The edge portion is engaged in the second groove.

[0013] In one feasible implementation, the second groove and the first groove form a stepped groove, and the orthographic projection of the first groove on the first surface falls within the orthographic projection of the second groove on the first surface.

[0014] In one feasible implementation, the first surface is characterized by having at least two first grooves, which are evenly distributed around the center of the through hole.

[0015] In one feasible implementation, the upper plastic is provided with a third groove, and the end face of the pole post away from the base is riveted into the cover plate.

[0016] Accordingly, the present invention also provides a battery, including any of the aforementioned battery top cover assemblies.

[0017] Implementing this utility model has the following beneficial effects:

[0018] The battery top cover assembly provided in this application embodiment has corresponding first protrusions and first grooves on the cover plate and the upper plastic. The upper plastic is fixed to the cover plate by hot-melting the first protrusion into the first groove, thereby fixing the upper plastic, the cover plate and the terminal post, completing the assembly of the battery top cover assembly, improving the assembly efficiency of the battery top cover assembly, and thus improving the assembly efficiency of the battery.

[0019] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0020] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application, and do not constitute an undue limitation of this application.

[0021] Figure 1 This is a three-dimensional structural schematic diagram of the battery top cover assembly shown in some embodiments of this application;

[0022] Figure 2 yes Figure 1 An exploded view of the battery top cover assembly shown.

[0023] Figure 3 yes Figure 1 A top view of the battery top cover assembly shown;

[0024] Figure 4 yes Figure 3 The battery top cover assembly shown is a cross-sectional view along FF;

[0025] Figure 5 yes Figure 4 A magnified view of the number I in the image;

[0026] Figure 6 This is a partial enlarged cross-sectional view of the battery top cover assembly shown in other embodiments of this application;

[0027] Figure 7 This is a partial enlarged cross-sectional view of the battery top cover assembly shown in some embodiments of this application.

[0028] The reference numerals in the figure:

[0029] 100-Battery top cover assembly;

[0030] 10-Cover plate, 101-Through hole, 102-First surface, 103-Second surface, 11-First groove, 12-Second groove

[0031] 20-Pole post, 21-Base, 22-Column, 23-Second protrusion

[0032] 30 - Upper plastic layer, 31 - First protrusion, 32 - Abutting part, 33 - Third groove

[0033] 41-First sealing ring, 42-Second sealing ring, 43-Support member,

[0034] 50-Underlying plastic. Detailed Implementation

[0035] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0036] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0037] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0038] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0039] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0040] Please refer to Figures 1 to 7 This application provides a battery top cover assembly 100 for covering a battery casing to manufacture a battery. The battery top cover assembly 100 includes a cover plate 10, a terminal post 20, and an upper plastic 30. The cover plate 10 has a first surface 102 and a second surface 103 disposed opposite to each other, and a through hole 101 is formed through the first surface 102 and the second surface 103. The terminal post 20 is insulated from the cover plate 10 and includes a post body 22 and a base 21. The post body 22 passes through the through hole 101, and the base 21 is located on one side of the second surface 103 of the cover plate 10. The upper plastic 30 is disposed on the first surface 102 of the cover plate 10 and is fitted onto the end of the post body 22 away from the base 21. The first surface 102 has a first groove 11, and the upper plastic 30 has a first protrusion 31 corresponding to the first groove 11. The first protrusion 31 is heat-fused and snapped into the first groove 11.

[0041] The battery top cover assembly 100 provided in this application embodiment has corresponding first protrusions 31 and first grooves 11 on the cover plate 10 and the upper plastic 30. The first protrusions 31 are heat-fused into the first grooves 11 to fix the upper plastic 30 to the cover plate 10, and then the upper plastic 30 is fastened to the outside of the terminal post 20 to complete the assembly of the battery top cover assembly 100, improve the assembly efficiency of the battery top cover assembly 100, and thus improve the assembly efficiency of the battery.

[0042] The first protrusion 31 can be heat-fused into the first groove 11 via ultrasonic heat fusion. Ultrasonic heat fusion is a highly efficient joining technology that uses high-frequency mechanical vibration (typically 20-40kHz) to generate heat through friction at the contact surfaces of thermoplastic materials, achieving rapid welding. Its working principle is to convert electrical energy into high-frequency vibration via a transducer, amplify it through an amplitude transformer, and then transmit it to the parts to be joined by the welding head. This causes the material molecules to move violently, generating instantaneous high temperatures. Under pressure, the interface melts and re-solidifies to form a seamless molecular bond. It features no need for additives, low energy consumption (completed in 0.1-3 seconds), and strength close to that of the raw material.

[0043] The core functions of the terminal post 20 include conductive connection, polarity identification, and structural fixation. Specifically, the terminal post 20 serves as the lead-out terminal of the battery, connecting the internal battery cell to the external circuitry and transferring electrical energy. The positive and negative terminals are distinguished by their shape, color, or markings. The terminal post 20, combined with the battery cover, ensures stability and vibration resistance.

[0044] The cover plate 10, commonly referred to as an aluminum plate, serves a structural support function, enhancing the mechanical strength of the battery top cover assembly 100 and preventing deformation. It also acts as a heat-conducting medium, aiding in battery heat dissipation. In lithium-ion batteries, the aluminum plate may serve as a connecting bridge between the positive electrode current collector and the terminal post 20. It provides protection in acidic or alkaline environments (the aluminum oxide film resists some corrosion). Common materials for the cover plate 10 include aluminum alloys, such as aluminum-manganese alloys, aluminum-magnesium alloys, or specially treated aluminum materials.

[0045] The upper plastic 30 can be an insulating gasket located at the top of the pillar 22 of the electrode post 20. The core functions of the upper plastic 30 include sealing and insulation, integrating safety components, and environmental resistance. Specifically, the upper plastic 30 covers the electrode post 20 and the aluminum plate (cover plate 10), forming a sealing layer through injection molding or sealing to prevent leakage and electrical short circuits. The upper plastic 30 also resists electrolyte corrosion, UV aging, and high-temperature deformation.

[0046] The aluminum plate serves as a support structure between the terminal post 20 and the aluminum plate, fixing the terminal post 20 and assisting in heat dissipation. A sealing and insulating material can also be placed between the terminal post 20 and the upper plastic 30. For example, a sealing assembly can be used to prevent electrolyte leakage and the intrusion of external air / moisture, ensuring a stable internal environment for the battery. The sealing assembly, positioned between the cover plate 10 and the terminal post 20, isolates the terminal post 20 from the metal cover, preventing short circuits. Furthermore, the sealing assembly can absorb mechanical vibration or thermal expansion stress, reducing impact on the sealing structure. The material of the sealing assembly can be fluororubber (FKM), silicone, or EPDM, etc.

[0047] In one feasible implementation, the sealing assembly includes a first sealing ring 41 and a second sealing ring 42. The first sealing ring 41 and the second sealing ring 42 are sleeved on the outside of the pole post 20 and disposed between the pole post 20 and the cover plate 10.

[0048] Furthermore, the new cover plate also includes a support member 43, which is located on the first surface 102 of the cover plate 10; the end of the pole post 20 facing the first surface 102 is provided with a snap-fit ​​part, and the first sealing ring 41 is provided between the pole post 20 body 22, the snap-fit ​​part and the support member 43. The projection of the snap-fit ​​part on the first surface 102 falls on the support member 43. The snap-fit ​​part of the pole post 20 can overlap the first sealing ring 41. The first sealing ring 41 is interference-fitted with the snap-fit ​​part and the support member 43, which not only fixes the end of the main body away from the base to one side of the second surface 103 of the cover plate 10, but also realizes the insulating and sealed connection between the pole post 20 and the top cover.

[0049] Specifically, the snap-fit ​​part can be formed by riveting the column 22 after it passes through the cover plate through hole 101, the center hole on the support member 43, and the first sealing ring 41 in sequence. Alternatively, several snap-fit ​​parts can be spaced apart on the column, and the snap-fit ​​parts are detachably connected to the column. After the column 22 passes through the cover plate through hole 101, the support member 43, and the first sealing ring 41 in sequence, the snap-fit ​​parts are installed, so that the projection of the snap-fit ​​parts on the first surface falls on the projection of the support member 43 on the first surface, thereby fixing the pole post. In short, any method or process that can fix the pole post to one side of the first surface of the cover plate is acceptable, and no further restrictions are imposed here.

[0050] In one feasible implementation, the battery top cover assembly 100 also includes a lower plastic 50. The lower plastic 50 may be an insulating gasket located between the base 21 of the terminal post 20 and the cover plate 10. The lower plastic 50 and the upper plastic 30 work together to ensure the safety and reliability of battery use. Furthermore, the upper plastic 30 covers and seals the terminal post 20, while the lower plastic 50 fixes the terminal post 20 and is welded to the casing, forming a double-layer leak-proof barrier.

[0051] In one feasible implementation, the projected area of ​​the bottom of the first groove 11 on the first surface 102 is larger than the projected area of ​​the opening of the first groove 11 on the first surface 102. Alternatively, at least a portion of the diameter or width inside the first groove 11 is larger than the diameter or width of the opening. This ensures the strength of the first protrusion 31 in the first groove 11 and improves the stability of the connection between the cover plate 10 and the upper plastic 30.

[0052] In one feasible implementation, the opening width of the first groove 11 gradually decreases from the bottom to the opening. This facilitates the entry of the first protrusion 31 into the first groove 11 during assembly, and allows the first protrusion 31 to better fill the first groove 11, thereby improving the reliability of the engagement between the first protrusion 31 and the first groove 11, and thus improving the assembly reliability of the battery top cover assembly 100. Further, the angle between the inner sidewall and the bottom wall of the first groove 11 is 70° to 85°. Optionally or preferably, the opening width of the first groove 11 gradually decreases from the bottom to the opening, and the angle between the inner sidewall and the bottom wall of the first groove 11 is 78° to 82°. This engagement strength ensures the engagement strength. The cross-section of the first groove 11 can be as follows: Figure 5 The trapezoidal structure shown in the diagram, the top view of the first groove 11 can be circular or square, while the first protrusion 31 can be cylindrical before hot melting. This makes it easier for the first protrusion 31 to be assembled into the first groove 11, and at the same time, it can ensure that the first protrusion 31 with the largest volume can enter the first groove 11, thereby ensuring the hot melting snap-fit ​​effect.

[0053] In one feasible implementation, the height of the first protrusion 31 is 0.9mm to 1.1mm, and the diameter of the first protrusion 31 is greater than 1.5mm. Correspondingly, the diameter of the opening of the first groove 11 is slightly larger than the diameter of the first protrusion 31. This ensures the engagement strength between the first protrusion 31 and the first groove 11.

[0054] In one feasible implementation, the bottom of the upper plastic 30 is provided with an abutment portion 32. The abutment portion 32 abuts against the first surface 102. A first protrusion 31 is provided on the abutment portion 32. The width of the abutment portion 32, parallel to the length direction of the cover plate 10, is 5mm to 8mm. This ensures sufficient space for the first protrusion 31, guarantees the size of the first protrusion 31, and prevents the first protrusion 31 from breaking off from the abutment portion 32.

[0055] In a feasible implementation, such as Figure 6As shown, the first surface 102 is also provided with a second groove 12, and the first groove 11 is formed on the bottom surface of the first surface 102. The bottom of the upper plastic 30 is accommodated in the second groove 12, and the bottom of the upper plastic 30 is provided with an edge portion corresponding to the second groove 12. The edge portion is engaged in the second groove 12. In this way, the edge portion of the upper plastic 30 can be hot-melted and engaged in the second groove 12, further increasing the strength of the fixed connection between the upper plastic 30 and the cover plate 10.

[0056] In one feasible implementation, the second groove 12 and the first groove 11 form a stepped groove. The orthographic projection of the first groove 11 on the first surface 102 falls within the orthographic projection of the second groove 12 on the first surface 102. Furthermore, the opening width of the second groove 12 gradually decreases from the bottom to the opening. In this way, after the edge of the upper plastic 30 is heat-melted, it forms an outwardly flared snap-fit ​​structure that snaps into the second groove 12, enhancing the connection between the upper plastic 30 and the cover plate 10.

[0057] In one feasible implementation, the first surface 102 has at least two first grooves 11. For example, there can be two, three, four, or more first grooves 11. This serves to prevent torsion, ensuring structural stability and preventing torsion from affecting the overall sealing performance of the cover plate 10. Furthermore, the first grooves 11 are evenly distributed around the center of the through hole 101. This enhances the connection between the upper plastic 30 and the cover plate 10, improves the snap-fit ​​strength, facilitates assembly, reduces stress concentration, and improves reliability.

[0058] In one feasible implementation, such as Figure 7 As shown, the upper plastic 30 is provided with a third groove 33, and the end face of the pole post 22 away from the base 21 is riveted into the cover plate 10. The end face of the pole post 22 away from the base 21 is provided with a second protrusion 23, and the third groove 33 corresponds to the second protrusion 23. The end face of the pole post 22 away from the base 21 is flush with the top surface of the cover plate 10. During assembly, the top end of the column 22 of the terminal post 20 passes sequentially through the lower plastic 50, the second sealing ring 42, the cover plate 10, the support member 43, the first sealing ring 41, and the upper plastic 30, and is then riveted and fixed to the upper plastic 30. The top end deforms to form a second protrusion 23, which is engaged in the third groove 33. In this way, the lower plastic 50 limits the base 21 of the terminal post 20, the upper plastic 30 limits the column 22 of the terminal post 20, and the top end of the terminal post 20 limits the upper plastic 30. Riveting it in the third groove 33 can further strengthen the connection strength between the upper plastic 30 and the cover plate 10, thereby improving the connection strength of the entire battery top cover assembly 100 structure and improving the quality of the battery top cover assembly 100.

[0059] Accordingly, this application also provides a battery. This battery includes any of the aforementioned battery top cover assemblies. The battery provided in this application has all the advantages corresponding to the aforementioned battery top cover assemblies, which will not be repeated here.

[0060] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0061] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A battery top cover assembly, characterized in that, Includes cover plate, pole post and upper plastic, among which, The cover plate has a first surface and a second surface that are disposed opposite to each other, and a through hole is provided through the first surface and the second surface; The pole post is insulated from the cover plate and includes a post body and a base. The post body passes through the through hole, and the base is located on one side of the second surface of the cover plate. The upper plastic is disposed on the first surface of the cover plate and sleeved on the end of the column away from the base; The first surface has a first groove, and the upper plastic has a first protrusion corresponding to the first groove, which is heat-fused and snapped into the first groove.

2. The battery top cover assembly according to claim 1, characterized in that, The projected area of ​​the bottom of the first groove on the first surface is greater than the projected area of ​​the opening of the first groove on the first surface.

3. The battery top cover assembly according to claim 2, characterized in that, The width of the first groove opening gradually decreases from the bottom of the groove to the opening.

4. The battery top cover assembly according to claim 3, characterized in that, The angle between the inner sidewall and the bottom wall of the first groove is 70° to 85°.

5. The battery top cover assembly according to claim 2, characterized in that, The height of the first protrusion is 0.9mm to 1.1mm, and the diameter of the first protrusion is greater than 1.5mm.

6. The battery top cover assembly according to claim 2, characterized in that, The bottom of the upper plastic is provided with an abutment portion, which abuts against the first surface. The first protrusion is provided on the abutment portion, and the width of the abutment portion parallel to the length direction of the cover plate is 5mm to 8mm.

7. The battery top cover assembly according to any one of claims 1 to 6, characterized in that, The first surface is also provided with a second groove, the first groove is formed on the bottom surface of the first groove, the bottom of the upper plastic is accommodated in the second groove, and the bottom of the upper plastic is provided with an edge portion corresponding to the second groove, the edge portion being engaged in the second groove; The second groove and the first groove form a stepped groove, and the orthographic projection of the first groove on the first surface falls within the orthographic projection of the second groove on the first surface.

8. The battery top cover assembly according to any one of claims 1 to 6, characterized in that, The first surface has at least two first grooves, which are evenly distributed around the center of the through hole.

9. The battery top cover assembly according to any one of claims 1 to 6, characterized in that, The upper plastic is provided with a third groove, and the end face of the pole away from the base is riveted into the cover plate.

10. A battery, characterized in that, Includes the battery top cover assembly as described in any one of claims 1 to 9.

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